nan Soedibyo

Power loss reduction strategy of distribution network with distributed generator integration

This paper proposes a strategy of power loss reduction of radial distribution network with distributed generator (DG) integration based on a fuzzy multi-objective method in order to improve the distribution system efficiency. Multi-objective functions are considered for power loss reduction, minimization of bus voltage deviation, and maintaining the load balancing among the feeder of distribution network. These objective functions are modeled with fuzzy sets to evaluate the imprecise nature of each objective. Originality of this work is the fuzzy-based multi-objective optimization in reconfiguration of distribution network including the distributed generator. The application of the fuzzy based multi-objective for distribution network reconfiguration on a 33-bus distribution network with integration of distributed generator is described. The test results show that the power loss of 33-bus radial distribution network experienced a significant reduction and voltage profile of each bus has also improved. The results show that a 72.34% of power loss reduction is achieved for the IEEE 33-bus network with DG integration.

The comparative study of Buck-boost, Cuk, Sepic and Zeta converters for maximum power point tracking photovoltaic using P&O method

Photovoltaic electricity generation is one alternative to use of renewable energy source. Efficiency of photovoltaic systems can be upgraded by operating photovoltaic panel at its optimum power point by using maximum power point tracking. Getting maximum power from the solar panels needed DC-DC converters by using the algorithm of MPPT. This paper presents a comparison study of the Buck-boost, Cuk, Sepic and Zeta converters as a device of MPPT. The algorithm for maximum power point tracking was a perturb and observe method. The simulation results of fourth converters were evaluated and compared, the parameters were observed of each DC-DC converters such forms of ripple current signal, the voltage on the input and the output sides, the input power and output power, as well as a steady state period and isolation signal between the input and output sides.

Control design of photovoltaic BPSX-60 using fuzzy logic controller for low voltage grid

This paper presents a system photovoltaic BPSX-60 in order to have continously electricity supply for low voltage grid. Output photovoltaic BPSX-60 is controlled by dc-dc boost converter to produce maximum power in order to obtain the MPP (Maximum Power Point). Output of the converter is controlled by fuzzy logic to obtain the MPP (Maximum Power Point) photovoltaic BPSX - 60, thus the efficiency photovoltaic BPSX - 60 can be increased. From the simulation using matlab 2010 can be concluded that the controller can shift power to 90 % maximum power of photovoltaic BPSX - 60.

Design and simulation of Neural Network Predictive Controller pitch-angle in permanent magnetic synchronous generator wind turbine variable pitch system

This paper considered maximum power extraction in wind turbines. However, the importance of constant power output of a wind turbine is increasing as the contribution of wind energy to the distribution network / grid grows. This may be considered as a guide of the future pitch angle control problems. The permanent magnetic synchrounous generator (PMSG) wind turbine variable pitch system is done through changing the electrical characteristics of the generator and changing the pitch angle. Also PMSG wind turbine variable pitch system is equipped with systems for regulating the orientation angles of the axis of the turbine against the wind and against the skyline. The design and simulation of Neural Network Predictive Controller (NNPC)-pitch angle involved in PMSG wind turbine variable pitch system is outlined. Its performance design is simulated to baseline linear controller through simulation in the range of wind speed is 7- 10 m/s. To test the designed NNPC-pitch angle performance, PMSG wind turbine variable pitch system has been simulated and results are constant power output.

Maximum power point tracking photovoltaic using root finding modified bisection algorithm

Photovoltaic is one of the most potential energy sources for the future, this is due to its characteristics pollution free also unlimited of availability. Maximum power point tracking methods are needed to make photovoltaic energy harvesting more efficient, modified bisection algorithms used as maximum power point tracking algorithm is embedded into the microcontroller ATMega 16. Modified bisection algorithm method divides the search area of the maximum power into two sections, and continues to be divided up by the specified iterations or when the power deviation compare to the voltage changes is zero. The simulation results show that modified bisection algorithm for tracking photovoltaics maximum power is potentially could theoretically to be implemented. On testing implementations use the microcontroller ATMega 16 found that when the potential value of the power is approximatelly 70 watt photovoltaic, then the algorithm can reach 62 watt.

Performance analysis of vertical axis wind turbine with variable swept area

This paper presents optimum power output from vertical axis wind turbine (VAWTs) by changing variable swept area. We used the H-Darrieus type of VAWTs, it has developed extendable blade and radius of VAWTs. These turbines response to the wind speed by changing swept area automatically extend outward at low wind speed and retract at excessive wind speed. This action increases the efficiency and get higher power capture at low wind speed. These innovative design found that the power production increased 260% over the turbines through variable swept area.

MPPT design on solar farm using perturb and observe technique considering tilt angle and partial shading in Giligenting Island

Giligenting Island is located in Sumenep, Madura. It is very potential for application the renewable energy. Based on the measurement, the maximum potential irradiance solar farm in the Island is accounted 610 W/m2. To convert the irradiance power to electricity, photovoltaic is applied. However, photovoltaic modules are drastically decrease their power output in case of the partial shading conditions. Therefore, perturb and obverse method (PnO) is introduced to track the point to establish the maximum power. In addition, the maximum power point tracking (MPPT) is employed to reduce the shading effects, thus by both method, the power generated is maximum. Besides, this technique is able to overcome the limitations in tracking efficiency, oscillation in steady state, and transient period. In this paper to maximize the irradiance observation, optimal site selection is undertaken by considering the tilt angles of PV and by approaching a sun path diagram model. Based on this study and experiment that have been taken in Giligenting Island, it is summed up that the proposed MPPT algorithm is superior to P&O technique with varies partial shading conditions. The results of the simulation yield that the power output of photovoltaic cover 99.4% of the load demand in Giligenting Island.

Electrical equivalent circuit based modeling and analysis of brushless direct current (BLDC) motor

BLDC motors are often used in many applications, such as Electric Vehicles (EVs) because of their simple structure, reliable operation, low maintenance, high dynamic speed, high torque and high efficiency. Basically, a BLDC motor is similar to conventional DC motor in performance but without brushes. Many papers and journals have been published regarding to the operation, speed control methods, starting methods, current control methods, and so on. One of ways to know the characteristic of BLDC motor is by modeling and simulation. In this study, the exact electrical equivalent circuit of BLDC motor related to mechanical and electrical equations is introduced. The electrical equations which have the same structure as mechanical equations are given. Thus, all of mechanical components are expressed into electrical circuit element terms. Numerical example of BLDC motor parameters is given, so the analysis of BLDC motor with load and without load is obtained by using the exact electrical equivalent circuit.

Design of batteries charging by charge management concepts on photovoltaic standalone system

Charging systems of battery electric current from the PV source with pulse charging technique is done to distribute high electric current to the battery without causing damage to the functionality and performance of the battery through a process to vary the pulse width. Techniques vary the pulse width is done by adjusting the duration of the charging current through the control of electronic switches, the advantage of this technique is there a time lag (break) for the battery in the process of stabilizing the electrode, besides the rate of temperature increase is small when charging process. The Charge management concept is the charging process of three battery units independently, when one battery is in full condition, the system will disconnect the charging line and two other units keep to do the battery charging process without being influenced by the change of battery. The implementation of this concept aims to maintain the power balance of PV in order to remain continuously supplies energy at the point of maximum. The simulation results of mode MPPT obtained an average of current charging of the battery-1, battery-2 12V/5Ah of 2,53A and battery-3 of 0,315A. The average level of the battery SOC rises in mode MPPT was battery-1 of 50.0237%, battery-2 of 50,024% and battery-3 of 50,0067 and mode constant voltage obtained battery-1 of 50.009%, battery-2 of 50,009% and battery-3 of 50,0067 for charging 2 seconds at radiant 1000W/m2 and a temperature of 25°C.

Design of frequency control on hybrid wind-diesel with PID-firefly

Power quality in hybrid wind turbine system with diesel (wind-diesel) affected by change of frequency fluctuation. Low - frequency oscillation due to the transmission network is long and low time constant and the high gain Automatic Voltage Regulator (AVR). Hybrid wind turbine system with diesel (wind-diesel) is controlled by Proportional Integral Derivative (PID) controllers. Trial - error method is used to determine the value of the gain of PID, so it is very difficult to get the optimum value. Study on the design control using Artificial Intelligent (AI) algorithms to find the optimum value of firefly from gain PID. The optimum value of the PID gain is used to adjust the frequency of the load with the matlab Simulink program. Hybrid wind turbine system with diesel (wind-diesel) with PID - firefly has a response which indicates that large overshoot and settling time response is being reduced and faster than a hybrid wind turbine system with diesel (wind-diesel) with PID trial-error.